Using 4 tubes, this 1924 receiver combines new technologies as an intermediate frequency stage that was already beginning to appear. Listening is via phone and battery power.
This circuit was found in old documentation, but the setting applies to any operational. Resistors...
We adapt this circuit of Radio Electronics - March 1990. The magazine no more exists, but the...
The circuit of the figure consists of a motor timer that can delay drives for up to 15 minutes....